Robert w



@1t-itch tait- @anni @ffice ROBERT W. Davis 'AND-1 nANrEL Davis,- "or' Loue istitu)4 Grrr, NEW Yoan. Letters Patent No. 63,226, dated March 26, 1867.

VIrrriwvniun'rrr In STEAM arrestaties,

@In tlgrtulctctcmh in itl there tttttts iihttut mit mating ont nt .the time TO kALL WHOM'IT MAY CONCERN: A y

Be it known that we, ROBERT W. Davis and Darien Davis, both ot Long Island City, inthe county vof Queens, 'and State of New York, have invented a certain new and useful Improvement on Steam Boilers', of -Which the following is a full, clear,-and exact description, reference being had to the accompanying drawing, inwhich-A vFigure 1 represents a vertical section ot`-a` boiler constructed according to our improvement, taken through the line x o: in iig. 3, the smokesbox being removed. y

Figurc\2, a similar view through the line e z in iig. 3, with smoke-bot attached and Figure 3, a plan of the same Without the smoke-box.

Like letters indicate like parts'throughout the several figures.

The nature of our invention consists in a novel arrangement of superheating spheres, disposed so as to form a-circle above the Abody' of theA boiler and within the smoke-box, so connected 'and' applied as to circulate or pass the steam successively through each sphere; and it further consists in a combination ofthe above with a central orupper steam-drying chamber, arranged within the smoke-box, and exposed to the draught for supply-l ing said spheres with steam; also said invention further' consists lin a peculiar arrangement ot'v fire-tubes and Acombustion-chambers in a vertical boiler, operatingpto throw theheat outwards, and whereby the greatest heat is brought to bear against the greatestl body of Water, so as to check or prevent foaming; likewise it consists in a combination with such arrangement of `{ire-tubes and combustion-chambers ci' au upper circular arrangement oi' superhcatin'g spheres, 7substantially as hereinbefore referred te. i i

Referring to the accompanying drawing, A represents the' fire-box or chamber of a vertical steam boiler ot' cylindrical character, and `Within wvhich may be arranged a grate oi' the description covered to us by Letters Patent of theUnited States bearing date April 17, 1866, or any other suitable grate. B B is the cylindrical Water and steam-generating space of the boiler, arranged over the lire-box, and so als to surround the latter. C C and C2- are smoke or draught-tubesand heating-chambers, connecting thefrechambcr A with the smokebox D. These tubes., of which there may be any number, are preferably arranged, theV one, C2, centrally over the r,e-box, and the others, C` C", in concentric circles; the outer oneG, beiugin more thorough or open communication with the smokc-box than `the inner tubes, whereby the draught is quickest and-more largely distributed through them, causing the heat to be thrown outwards, and the greatest heat brought to bearl against the greatest body of Watenwhich will tend to check or prevent foamin Wllere'a central tube, C2, is used i-t may be Wholly, or vnearly so, a closed heating-chamber rather than a draught-tube,lto prevent a central or'direct escapeofflieat/,and causing the latter to be more eifectuallyprojeeted outwards, for which purpose Asaid ccntral'tube may be covered at its top by a cap, through which only a contracted aperture, e, (if any,) should be made. The inner row or series of smoke-tubes C also have their outlets, in a measure, contracted, or direct draughtfrom them checked, and which may be effected by a steam dome, E, or other chamber, arranged Within the smoke-box and over the inner series or" smoke-tubes,hor other suitable cover equivalently arranged, and operating to 4contract the draught, which, so far as these tubes are concerned, may finally'p'assol` upa tube, d, through said dome, that, by thisv arrangement, not only contributes to establish the greatest draught outi wardly from thc hre-box, but that is directly heated by the gases escaping Vwith the draught, both beneath, vinternally, and externally. This steam-chamber or dome E, Whichmay be of any suitable shape, differs from an ordinary steam dome in being of a close character, it onlygetting 'its supply of steam. from the boiler by pipes e. It may further, however, be provided with a pipe,f, extending downwards into the Water space to return any condensedstcam in the dome back to the boiler. Situated as described, and acted on by the escap ing heated gases, this dome becomes a steam-drying chamber, from which, preferably vat or near thc top, Where the steam is dryest, thesupply is taken byapipe, g, to the super-heating chambers. i These superheating chambers consist of a series o'f spheres, Gr, arranged so as to forni a circle outside the dome, Within the smokebox','nnd directly over the outer row of smoke-tubes C, through which the draught is strongest and greatest" heat passes, that thus cifcctually contributes to the superheating of the steam in the spheres.- The steam, supplied by `the pipe g, is iirstlpasscd to one of the spheres, and from. thence, by connecting pipes la, to the other 'spheres iusuccession till arrivin'get the lst. in the circle, from whence itv may be taken in a. dryand A superhected state bylaJ pipe, k, to perform the Work required of4 it.

Whatl we claim as new, and desire to secure by Letters Patent, isv 1. The arrangement'over the body of the boiler, and within 'the smoke-box, ofc. series or circle of superhea'ting spheres connected and applied to circulate or pass Athe steam received from the boiler suecessiiely .through them, substantially as specified. v v

2. The combination, with the steam-drying chamber or dome E, of c. series or circle of superheating spheres G, both arranged within the smoke-box of :L vertical boiler, for operation in connection vritheaeh other, und with a steam-generating space or chamber below, essentially as described.

3. The combination,witl1 the smoke-box :mtl body of the boiler, of an inner and outer series of smoketubes and fmnlbustionl orAheating-ebambers, the inner series having their draught contracted relatively to the outer'series, essentially as and -forthe purpose or purposes herein set forth.

4=.- The combination of thesuperheating spheres Gr, arranged a-s described, smoke-box D, and outer row or series of smoke-tubes C, arranged relatively to the-spheres, substantially as specified.

R. W. DAVIS,

DANIEL DAVIS.

' Witnesses:

A. LE CLERC, G. W. REED.. 

